Granular cooling of ellipsoidal particles in microgravity - Kölner UniversitätsPublikationsServer

Pitikaris, Sebastian, Bartz, Patricia, Yu, Peidong ORCID: 0000-0001-6664-5942, Cristoforetti, Samantha and Sperl, Matthias ORCID: 0000-0001-9525-0368 (2022). Granular cooling of ellipsoidal particles in microgravity. NPJ Microgravity, 8 (1). BERLIN: NATURE PORTFOLIO. ISSN 2373-8065

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DOI:10.1038/s41526-022-00196-6

Abstract

A three-dimensional granular gas of ellipsoids is established by exposing the system to the microgravity environment of the International Space Station. We use two methods to measure the dynamics of the constituent particles and report the long-time development of the granular temperature until no further particle movement is detectable. The resulting cooling behavior can be well described by Haff's cooling law with time scale tau. Different analysis methods show evidence of particle clustering towards the end of the experiment. By using the kinetic theory for ellipsoids we compare the translational energy dissipation of individual collision events with the overall cooling time scale tau. The difference from this comparison indicates how energy is distributed in different degrees of freedom including both translation and rotation during the cooling.

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Pitikaris, Sebastian	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Bartz, Patricia	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Yu, Peidong	UNSPECIFIED	orcid.org/0000-0001-6664-5942	UNSPECIFIED
Cristoforetti, Samantha	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Sperl, Matthias	UNSPECIFIED	orcid.org/0000-0001-9525-0368	UNSPECIFIED